#include <bits/stdc++.h>
    using namespace std;
    #include <atcoder/all>
    using namespace atcoder;
    #define rep(i, n) for(int i=0;i<(n);++i)
    #define rep1(i, n) for(int i=1;i<=(n);i++)
    #define ll long long
    using mint = modint998244353;
    using P = pair<ll,ll>;
    using lb = long double;
    using T = tuple<ll, ll, ll>;
    #ifdef LOCAL
    #  include <debug_print.hpp>
    #  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
    #else
    #  define dbg(...) (static_cast<void>(0))
    #endif

    int main()
    {
        int t;
        cin >> t;
        rep(_,t){
            int n;
            cin >> n;
            vector<int> a(n);
            rep(i,n) cin >> a[i];
            vector<int> cnt(3);
            rep(i,n) cnt[a[i]]++;
            bool ok = true;
            rep(i,n-1){
                if(a[i]!=1 && a[i]==a[i+1]) ok = false;
            }
            if(cnt[0]>=1 && cnt[2]>=1  && ok){
                cout << "Yes" << endl;
            }
            else{
                cout << "No" << endl;
            }
        }

        return 0;
    }